3605409 has 6 divisors (see below), whose sum is σ = 5207826. Its totient is φ = 2403600.

The previous prime is 3605387. The next prime is 3605419. The reversal of 3605409 is 9045063.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2471184 + 1134225 = 1572^2 + 1065^2 .

It is not a de Polignac number, because 3605409 - 2⁷ = 3605281 is a prime.

3605409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3605419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200292 + ... + 200309.

It is an arithmetic number, because the mean of its divisors is an integer number (867971).

Almost surely, 2^3605409 is an apocalyptic number.

It is an amenable number.

3605409 is a deficient number, since it is larger than the sum of its proper divisors (1602417).

3605409 is a wasteful number, since it uses less digits than its factorization.

3605409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400607 (or 400604 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 3605409 is about 1898.7914577436. The cubic root of 3605409 is about 153.3386067289.

The spelling of 3605409 in words is "three million, six hundred five thousand, four hundred nine".